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Effect of Cobalt Contents on the Biocompatibility and Corrosion Properties of Fe-31Cr-27Ni-1.6Mo-1.5W-0.26N Alloy  

Jang, Soon Geun (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University)
Yoo, Young Ran (Center for Advanced Life Cycle Engineering, University of Maryland)
Nam, Hee Soo (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University)
Shim, Gyu Tae (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University)
Kim, Jung Gu (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
Kim, Young Sik (The Center of Green Materials Technology, School of Advanced Materials Engineering, Andong National University)
Publication Information
Korean Journal of Metals and Materials / v.46, no.4, 2008 , pp. 209-216 More about this Journal
Abstract
Super austenitic stainless steels shows the high PRE (Pitting Resistance Equivalent) number and the good corrosion resistance. This work controlled the Co contents in Fe-31Cr-1.7Mo-27Ni-0.25N alloys to elucidate the effect of cobalt contents on the biocompatibility and corrosion resistance. Increasing Co contents, the hardness of the annealed alloys tends to be reduced. In aged alloys, cobalt decreased the increments of hardness by aging treatment. Cobalt decreased the critical pitting temperature (CPT) in 6% $FeCl_3$ + 1% HCl solution, but improved the anodic polarization behavior in Hanks' balanced salt solution and artificial saliva solution. Repassivation rate in artificial body solutions was improved by increasing cobalt contents, but didn't show the linear relationship to PRE number of the alloys. The experimental alloys showed the non-cytotoxicity because of its high corrosion resistance.
Keywords
super austenitic stainless steel; cobalt; biocompatibility; pitting; anodic polarization; repassivation;
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